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> One thing I like to point out for people is that milkweed has the second-most advanced flowers on the planet, following only orchids.

What does "advanced" mean, of flowers?

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means 'complex' - from Wikipedia " Five petals reflex backwards revealing a gynostegium surrounded by a five-membrane corona. The corona is composed of a five-paired hood-and-horn structure with the hood acting as a sheath for the inner horn"

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